Silicon nitride window for microsampling device and method of construction
First Claim
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1. Method of constructing a window in a silicon cuvette, comprising the steps of:
- providing a silicon substrate having a top surface and a bottom surface;
etching a depression in the top surface of the silicon substrate defining a microsample chamber;
depositing a silicon nitride film on the top surface of the silicon substrate and in the chamber; and
etching a depression in the bottom surface of the silicon substrate in registration with the chamber in the top surface for exposing the silicon nitride film within the chamber to form the window.
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Abstract
A silicon nitride cuvette window for a microsampling device and method of construction are provided. The sample to be analyzed is drawn into the cuvette of the microsampling device. The silicon nitride window permits optical measurements to be made on analytes contained within the cuvette.
51 Citations
11 Claims
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1. Method of constructing a window in a silicon cuvette, comprising the steps of:
providing a silicon substrate having a top surface and a bottom surface;
etching a depression in the top surface of the silicon substrate defining a microsample chamber;
depositing a silicon nitride film on the top surface of the silicon substrate and in the chamber; and
etching a depression in the bottom surface of the silicon substrate in registration with the chamber in the top surface for exposing the silicon nitride film within the chamber to form the window. - View Dependent Claims (2, 3, 9, 10)
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4. Method of constructing a chamber window in a microsample chamber, comprising the steps of:
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providing a silicon substrate having a sampling side and a viewing side;
etching a depression in the sampling side of the silicon substrate defining a microsample chamber, a needle bore, and a vent;
depositing a silicon nitride film in at least the microsample chamber; and
etching a depression in the viewing side of the silicon substrate in registration with the microsample chamber in the sampling side for exposing the silicon nitride film within the microsample chamber to form the chamber window. - View Dependent Claims (5, 6, 7, 8)
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11. Method of constructing a window in a silicon cuvette, comprising the steps of:
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providing a silicon substrate having a top surface and a bottom surface;
etching a depression in the top surface of the silicon substrate defining a microsample chamber;
depositing a silicon nitride film in at least the chamber; and
etching a depression in the bottom surface of the silicon substrate in registration with the chamber in the top surface for exposing the silicon nitride film within the chamber to form the chamber window.
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Specification